Features:
1700 mAh lithium polymer rechargeable battery
Portable, compact and simplicity.
Custom fit for the contour of iPhone 4 4S precisely.
Designed for use on the go or in an emergency.
Used for charging your iPhone 4 4S anytime and anywhere.
Standby time: up to 210 hours
Talk time: up to 5 hours on 3G network, up to 10 hours on 2G network
Internet use: up to 4.5 hours on 3G network, up to 7 hours on WIFI
Audio play: up to 28 hours
Video play: up to 7 hours
Input: DC 5V 500mA
Output: DC 5V 500mA

Package included:
1 x Backup Battery Case Charger for iPhone 4 4S
1 x USB cable
1 x Micro USB charging cord
1 x Manual